1. To be very similar to something: Joyce's mood mirrored the feeling of failure.
2. To show the image of something on a surface: It was easy to see the building being mirrored in the lake.

A computer programmer can mirror a process that exactly duplicates computer information from one location to another.

3. In psychiatry, a technique in psychodrama in which another person in the group plays the role of the patient who is watching the enactment as if he or she were gazing into a mirror: The first person may exaggerate one or more aspects of the patient's behavior that was mirroring his or her actions.

Following the portrayal, the patient is usually encouraged to comment on what he or she has seen during the process as it was being mirrored.